while that's a pity, i am not terribly worried. we managed it once without previous experience, so we can manage it again. in fact the less we rely on past experience the more we develop the capacity to do difficult things without prior experience. (that sounds like a contradiction in terms, but i hope it makes sense. it's kind of like linux from scratch. or the learning benefits from reinventing the wheel. instead of improving how to travel to the moon we improve the process of how to develop moon travel)